Type III Flashcards
7 cards from real EPA 608 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Type III flashcards as text
Non-condensables (air) in a low-pressure system will cause condenser pressure to:
Answer: Rise above normal for the condensing temperature
Air accumulating in the condenser raises pressure above what the refrigerant alone would produce.
A rupture disc on a low-pressure chiller is designed to:
Answer: Relieve excess pressure to protect the vessel
A rupture disc is a pressure relief device that protects the appliance from overpressure.
If a low-pressure system's rupture disc fails or releases, the technician should:
Answer: Recover refrigerant and replace the disc before recharging
A released disc means the charge is lost and the disc must be replaced before recharging.
When water leaks into a low-pressure chiller's refrigerant, the technician should be concerned about:
Answer: Formation of acids and corrosion
Moisture combines with refrigerant to form corrosive acids that damage the system.
The high boiling point of low-pressure refrigerants means that at room temperature they can exist as:
Answer: A liquid that boils near room conditions
Low-pressure refrigerants are liquids that boil at relatively warm temperatures.
Before opening a low-pressure appliance for service, the technician must first:
Answer: Recover the refrigerant to the required level
Refrigerant must be recovered to the required vacuum before the system is opened.
Low-pressure recovery is generally slower than high-pressure recovery because:
Answer: The low vapor pressure provides little driving force
Low vapor pressure provides minimal force to move refrigerant, slowing recovery.